VOLUME 53 (1)/April 2024

Faculty of Geology and Exploration, University of Mining and Geology, 1700 Sofia, Bulgaria
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Faculty of Geology and Exploration, University of Mining and Geology, 1700 Sofia, Bulgaria
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Faculty of Geology and Exploration, University of Mining and Geology, 1700 Sofia, Bulgaria

Earth and Man National Museum, 4 Cherni Vrah Blvd., 1421 Sofia, Bulgaria
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Faculty of Geology and Geography, Department of Mineralogy, Petrology and Economic Geology, Sofia University “St. Kliment Ohridski”, 15 Tsar Osvoboditel Blvd., 1504 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria